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Aerobic–Anaerobic Microbial Wastewater Transformations and Re-aeration in an Air-Injected Pressure Sewer

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Abstract:

Wastewater quality changes and re-aeration during transport in an air-injected pressure sewer (force main) were studied. Samples were taken from an air-injected pressure sewer located in the northern part of Japan. The study focused on the transformations of wastewater organic matter as characterized by measurements of oxygen uptake rate. Wastewater was maintained under aerobic conditions by injecting air, which controlled sulfide formation and removed readily biodegradable substrate (SS ) by aerobic microbial processes. To preserve SS , it was necessary to decrease dissolved oxygen concentration by reducing air-injection flow rate. An aerobic–anaerobic wastewater process model for the air-injected pressure sewer was established, and model parameters were determined based on experimental findings. It was possible to simulate transformations of wastewater organic matter, dissolved oxygen, and sulfide. The model can be applied to determine an appropriate air-injection flow rate to control sulfide formation and reduce SS removal.

Keywords: AEROBIC PROCESS; AIR INJECTION; MODEL; OXYGEN UPTAKE RATE; PRESSURE SEWER; RE-AERATION; SIMULATION; SULFIDE FORMATION; WASTEWATER TRANSFORMATION

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143000X138274

Publication date: November 1, 2000

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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